What prop do I have? Repair candidate?

[Darter]

Took my prop off to have it balanced and the edges cleaned up. The online literature for this boat says it should be a 13x13 4 blade, which the end of hub stamp says.

But there's another stamp along the side of the hub that says "OJ 1203".

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When I look at the OJ site, this indicates a 12x13. Is this just a date code? That's roughly around the build date of my boat, so that would make sense.

Also, when do you guys typically get your props refinished? Do you wait until there's vibration, or whenever there's a nick in it? Mine just has a few half-pea sized nicks on a few of the blades. I'm not sure on vibration, as we don't have another boat to compare to (and the prop hasn't changed condition much since we bought the boat a year ago).

This first blade is the worst, with the deflection along the edge.

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